Kernel 3.2 has an annoying error for my wireless card (rtl8192se-b) that makes the connection drop and/or prevents the card to make a connection to the wireless router. Dealing with it was very frustrating until I found out the bug was corrected in 3.4.
I downloaded:

linux-headers-3.4.0-030400_3.4.0-030400.201205210521_all.deb

linux-headers-3.4.0-030400_3.4.0-030400.201205210521_all.deb

linux-image-3.4.0-030400-generic_3.4.0-030400.201205210521_amd64.deb

and installed with: sudo dpkg -i *

Now the wireless works fine, but I have two problems that cannot solve.
The first one is minor: plymouth would not start at all. But if I boot with the 3.2 kernel it works fine.

The second one is serious: sometimes the computer won't shut down or reboot. The X server terminates but the computer shows part of my grub background and will stay there forever using 100% of the CPU.

I have a Toshiba Qosmio with an Core i7 and nvidia graphic card (using nvidia-current).
During one shutdown, I briefly read a message that said that the virtualbox module couldn't be unloaded from the kernel. I tried to solve this by removing and purging virtualbox and installing it back. I don't see the message anymore, but sometimes the computer won't shutdown nor reboot.

1 Answer
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How to install Linux Kernel 3.5 in Ubuntu 12.04. WARNING This isn't worth doing unless you're having problems with the old kernel or you're adding new hardware which is unsupported in old Kernel 3.2, such as nVidia Kepler (600 series) or AMD HD 7000 series Graphics cards.